Welcome to the Mirage Machines Portable Performance Blog

In focus: The Casing double pin drill for platform decommissioning

Posted by Simon Pownall on Aug 8, 2014 12:09:00 PM


    

In a new feature for the Mirage blog we'll be taking an in-depth look at a specific portable machine tool. This week we take a look at the Casing Double Pin Drill (16-36").

DDU1636 (16 - 36") Casing Double Pin Drill

casing_double_pin_drill_platform_decommissioning

Review

A casing drilling unit fit for all lift pinning operations, this machinery is normally used in conjunction with the band saw to provide a very efficient method of cutting and decommissioning pipelines, conductors, caissons and multiple grouted strings.

The drill features precision linear guides to ensure hole accuracy, helical gear driven spindles, quick clamp swing gate, and a flanged spindle for 4", 6" or 12" cutting spindles.

The machine is supplied complete with toolkit including quick release connectors, all required mounting legs and extensions, storage / shipping crate, CE certificate, packing list and manual.

Technical specifications

Range

  • Pipe diameter: 152mm (6") minimum, 915mm (36") maximum
  • Clamping diameter: 405mm (16") minimum, 915mm (36") maximum
  • Cutter and spindle diameter: 100mm (4") minimum, 305mm (12") maximum

Rates

  • Cutting stroke: 405mm (16")
  • Drive: Hydraulic at 70bar (1050 p.s.i) 5.0Hp or 3.7 Kw
  • Manual advance p/revolution: 4mm (0.157")

Weights

  • Machine weight inc. bases: 472 kg (1038 lbs)
  • Shipping weight: 572 kg (1258 lbs)

Platform decommissioning

Used at subsea and surface level, a drilling pinning machine together with a subsea band saw have been used in the North Sea, UK, Norway and the Gulf of Mexico.

For surface cuts the drill unit has a split joint that is clamped onto the casing and then an auto feed system to feed the cutter through, while the band saw has a mechanical vice jaw that clamps around the casing and then an auto feed system to feed the blade through.

A 48” multiple casing is drilled in approx 15 minutes and cut in approx 40 minutes, giving a fast, efficient, cost effective cold cutting method for inserting lifting pins into multiple casing strings and cutting multiple casing strings with or without grouted annuli.

Case Study

ONET required stainless steel pipes to be cut and removed, below concrete, in a highly radioactive environment in North France. With internal diameters ranging between 30mm and 153mm, the steel pipes required extraction 5 metres below reactor main floor level, through concrete.

Mirage custom designed the machine and tooling to complete the job which included supplying a bandsaw with steel tooling to cut through the thick pipes, as well as 2 pairs of severing and extraction machine.

Issues with nuclear exposure absorption were overcome through the use of a special coating on all machines, meaning the risk to health and safety of their staff was kept to a minimum.

Download the Mirage Machines Drilling and Tapping Machine Buyers Guide

Topics: platform decommissioning, drilling

   

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